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Aug 19, 2011 at 10:35 comment added kaleidoscop Then I think one should look for a function $\psi$ that scatters the points somehow. I think it could be related to find Borel sets $A$ and $B$ occupying half the measure everywhere, meaning for all Borel $C$, $${\rm leb}(A\cap C)={\rm leb}(B\cap C)={\rm leb}(C)/2,$$ but I guess this is impossible.
Aug 18, 2011 at 22:30 comment added Noah Stein The lemma that the entropy of a function of a discrete random variable is at most the entropy of the random variable itself is false if you replace "discrete" with "continuous" and "entropy" with "differential entropy". For example you can scale a Gaussian random variable to produce one with any given variance and thereby any differential entropy. So at least this proof does not apply to variables with density.
Aug 18, 2011 at 22:08 comment added kaleidoscop Indeed, very elegant solution, thank you very much. It should also apply to variables with density, no?
Aug 18, 2011 at 22:07 vote accept kaleidoscop
Aug 18, 2011 at 20:33 history answered Noah Stein CC BY-SA 3.0